Andrew's git / gitweb.git / builtin-branch.c
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builtin-branch.con commit Reduce the number of connects when fetching (ba22785)
   1/*
   2 * Builtin "git branch"
   3 *
   4 * Copyright (c) 2006 Kristian Høgsberg <krh@redhat.com>
   5 * Based on git-branch.sh by Junio C Hamano.
   6 */
   7
   8#include "cache.h"
   9#include "color.h"
  10#include "refs.h"
  11#include "commit.h"
  12#include "builtin.h"
  13#include "remote.h"
  14#include "parse-options.h"
  15
  16static const char * const builtin_branch_usage[] = {
  17        "git-branch [options] [-r | -a]",
  18        "git-branch [options] [-l] [-f] <branchname> [<start-point>]",
  19        "git-branch [options] [-r] (-d | -D) <branchname>",
  20        "git-branch [options] (-m | -M) [<oldbranch>] <newbranch>",
  21        NULL
  22};
  23
  24#define REF_UNKNOWN_TYPE    0x00
  25#define REF_LOCAL_BRANCH    0x01
  26#define REF_REMOTE_BRANCH   0x02
  27#define REF_TAG             0x04
  28
  29static const char *head;
  30static unsigned char head_sha1[20];
  31
  32static int branch_track = 1;
  33
  34static int branch_use_color;
  35static char branch_colors[][COLOR_MAXLEN] = {
  36        "\033[m",       /* reset */
  37        "",             /* PLAIN (normal) */
  38        "\033[31m",     /* REMOTE (red) */
  39        "",             /* LOCAL (normal) */
  40        "\033[32m",     /* CURRENT (green) */
  41};
  42enum color_branch {
  43        COLOR_BRANCH_RESET = 0,
  44        COLOR_BRANCH_PLAIN = 1,
  45        COLOR_BRANCH_REMOTE = 2,
  46        COLOR_BRANCH_LOCAL = 3,
  47        COLOR_BRANCH_CURRENT = 4,
  48};
  49
  50static int parse_branch_color_slot(const char *var, int ofs)
  51{
  52        if (!strcasecmp(var+ofs, "plain"))
  53                return COLOR_BRANCH_PLAIN;
  54        if (!strcasecmp(var+ofs, "reset"))
  55                return COLOR_BRANCH_RESET;
  56        if (!strcasecmp(var+ofs, "remote"))
  57                return COLOR_BRANCH_REMOTE;
  58        if (!strcasecmp(var+ofs, "local"))
  59                return COLOR_BRANCH_LOCAL;
  60        if (!strcasecmp(var+ofs, "current"))
  61                return COLOR_BRANCH_CURRENT;
  62        die("bad config variable '%s'", var);
  63}
  64
  65static int git_branch_config(const char *var, const char *value)
  66{
  67        if (!strcmp(var, "color.branch")) {
  68                branch_use_color = git_config_colorbool(var, value, -1);
  69                return 0;
  70        }
  71        if (!prefixcmp(var, "color.branch.")) {
  72                int slot = parse_branch_color_slot(var, 13);
  73                color_parse(value, var, branch_colors[slot]);
  74                return 0;
  75        }
  76        if (!strcmp(var, "branch.autosetupmerge"))
  77                        branch_track = git_config_bool(var, value);
  78
  79        return git_default_config(var, value);
  80}
  81
  82static const char *branch_get_color(enum color_branch ix)
  83{
  84        if (branch_use_color)
  85                return branch_colors[ix];
  86        return "";
  87}
  88
  89static int delete_branches(int argc, const char **argv, int force, int kinds)
  90{
  91        struct commit *rev, *head_rev = head_rev;
  92        unsigned char sha1[20];
  93        char *name = NULL;
  94        const char *fmt, *remote;
  95        char section[PATH_MAX];
  96        int i;
  97        int ret = 0;
  98
  99        switch (kinds) {
 100        case REF_REMOTE_BRANCH:
 101                fmt = "refs/remotes/%s";
 102                remote = "remote ";
 103                force = 1;
 104                break;
 105        case REF_LOCAL_BRANCH:
 106                fmt = "refs/heads/%s";
 107                remote = "";
 108                break;
 109        default:
 110                die("cannot use -a with -d");
 111        }
 112
 113        if (!force) {
 114                head_rev = lookup_commit_reference(head_sha1);
 115                if (!head_rev)
 116                        die("Couldn't look up commit object for HEAD");
 117        }
 118        for (i = 0; i < argc; i++) {
 119                if (kinds == REF_LOCAL_BRANCH && !strcmp(head, argv[i])) {
 120                        error("Cannot delete the branch '%s' "
 121                                "which you are currently on.", argv[i]);
 122                        ret = 1;
 123                        continue;
 124                }
 125
 126                if (name)
 127                        free(name);
 128
 129                name = xstrdup(mkpath(fmt, argv[i]));
 130                if (!resolve_ref(name, sha1, 1, NULL)) {
 131                        error("%sbranch '%s' not found.",
 132                                        remote, argv[i]);
 133                        ret = 1;
 134                        continue;
 135                }
 136
 137                rev = lookup_commit_reference(sha1);
 138                if (!rev) {
 139                        error("Couldn't look up commit object for '%s'", name);
 140                        ret = 1;
 141                        continue;
 142                }
 143
 144                /* This checks whether the merge bases of branch and
 145                 * HEAD contains branch -- which means that the HEAD
 146                 * contains everything in both.
 147                 */
 148
 149                if (!force &&
 150                    !in_merge_bases(rev, &head_rev, 1)) {
 151                        error("The branch '%s' is not an ancestor of "
 152                                "your current HEAD.\n"
 153                                "If you are sure you want to delete it, "
 154                                "run 'git branch -D %s'.", argv[i], argv[i]);
 155                        ret = 1;
 156                        continue;
 157                }
 158
 159                if (delete_ref(name, sha1)) {
 160                        error("Error deleting %sbranch '%s'", remote,
 161                               argv[i]);
 162                        ret = 1;
 163                } else {
 164                        printf("Deleted %sbranch %s.\n", remote, argv[i]);
 165                        snprintf(section, sizeof(section), "branch.%s",
 166                                 argv[i]);
 167                        if (git_config_rename_section(section, NULL) < 0)
 168                                warning("Update of config-file failed");
 169                }
 170        }
 171
 172        if (name)
 173                free(name);
 174
 175        return(ret);
 176}
 177
 178struct ref_item {
 179        char *name;
 180        unsigned int kind;
 181        unsigned char sha1[20];
 182};
 183
 184struct ref_list {
 185        int index, alloc, maxwidth;
 186        struct ref_item *list;
 187        struct commit_list *with_commit;
 188        int kinds;
 189};
 190
 191static int has_commit(const unsigned char *sha1, struct commit_list *with_commit)
 192{
 193        struct commit *commit;
 194
 195        if (!with_commit)
 196                return 1;
 197        commit = lookup_commit_reference_gently(sha1, 1);
 198        if (!commit)
 199                return 0;
 200        while (with_commit) {
 201                struct commit *other;
 202
 203                other = with_commit->item;
 204                with_commit = with_commit->next;
 205                if (in_merge_bases(other, &commit, 1))
 206                        return 1;
 207        }
 208        return 0;
 209}
 210
 211static int append_ref(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
 212{
 213        struct ref_list *ref_list = (struct ref_list*)(cb_data);
 214        struct ref_item *newitem;
 215        int kind = REF_UNKNOWN_TYPE;
 216        int len;
 217
 218        /* Detect kind */
 219        if (!prefixcmp(refname, "refs/heads/")) {
 220                kind = REF_LOCAL_BRANCH;
 221                refname += 11;
 222        } else if (!prefixcmp(refname, "refs/remotes/")) {
 223                kind = REF_REMOTE_BRANCH;
 224                refname += 13;
 225        } else if (!prefixcmp(refname, "refs/tags/")) {
 226                kind = REF_TAG;
 227                refname += 10;
 228        }
 229
 230        /* Filter with with_commit if specified */
 231        if (!has_commit(sha1, ref_list->with_commit))
 232                return 0;
 233
 234        /* Don't add types the caller doesn't want */
 235        if ((kind & ref_list->kinds) == 0)
 236                return 0;
 237
 238        /* Resize buffer */
 239        if (ref_list->index >= ref_list->alloc) {
 240                ref_list->alloc = alloc_nr(ref_list->alloc);
 241                ref_list->list = xrealloc(ref_list->list,
 242                                ref_list->alloc * sizeof(struct ref_item));
 243        }
 244
 245        /* Record the new item */
 246        newitem = &(ref_list->list[ref_list->index++]);
 247        newitem->name = xstrdup(refname);
 248        newitem->kind = kind;
 249        hashcpy(newitem->sha1, sha1);
 250        len = strlen(newitem->name);
 251        if (len > ref_list->maxwidth)
 252                ref_list->maxwidth = len;
 253
 254        return 0;
 255}
 256
 257static void free_ref_list(struct ref_list *ref_list)
 258{
 259        int i;
 260
 261        for (i = 0; i < ref_list->index; i++)
 262                free(ref_list->list[i].name);
 263        free(ref_list->list);
 264}
 265
 266static int ref_cmp(const void *r1, const void *r2)
 267{
 268        struct ref_item *c1 = (struct ref_item *)(r1);
 269        struct ref_item *c2 = (struct ref_item *)(r2);
 270
 271        if (c1->kind != c2->kind)
 272                return c1->kind - c2->kind;
 273        return strcmp(c1->name, c2->name);
 274}
 275
 276static void print_ref_item(struct ref_item *item, int maxwidth, int verbose,
 277                           int abbrev, int current)
 278{
 279        char c;
 280        int color;
 281        struct commit *commit;
 282
 283        switch (item->kind) {
 284        case REF_LOCAL_BRANCH:
 285                color = COLOR_BRANCH_LOCAL;
 286                break;
 287        case REF_REMOTE_BRANCH:
 288                color = COLOR_BRANCH_REMOTE;
 289                break;
 290        default:
 291                color = COLOR_BRANCH_PLAIN;
 292                break;
 293        }
 294
 295        c = ' ';
 296        if (current) {
 297                c = '*';
 298                color = COLOR_BRANCH_CURRENT;
 299        }
 300
 301        if (verbose) {
 302                struct strbuf subject;
 303                const char *sub = " **** invalid ref ****";
 304
 305                strbuf_init(&subject, 0);
 306
 307                commit = lookup_commit(item->sha1);
 308                if (commit && !parse_commit(commit)) {
 309                        pretty_print_commit(CMIT_FMT_ONELINE, commit,
 310                                            &subject, 0, NULL, NULL, 0, 0);
 311                        sub = subject.buf;
 312                }
 313                printf("%c %s%-*s%s %s %s\n", c, branch_get_color(color),
 314                       maxwidth, item->name,
 315                       branch_get_color(COLOR_BRANCH_RESET),
 316                       find_unique_abbrev(item->sha1, abbrev), sub);
 317                strbuf_release(&subject);
 318        } else {
 319                printf("%c %s%s%s\n", c, branch_get_color(color), item->name,
 320                       branch_get_color(COLOR_BRANCH_RESET));
 321        }
 322}
 323
 324static void print_ref_list(int kinds, int detached, int verbose, int abbrev, struct commit_list *with_commit)
 325{
 326        int i;
 327        struct ref_list ref_list;
 328
 329        memset(&ref_list, 0, sizeof(ref_list));
 330        ref_list.kinds = kinds;
 331        ref_list.with_commit = with_commit;
 332        for_each_ref(append_ref, &ref_list);
 333
 334        qsort(ref_list.list, ref_list.index, sizeof(struct ref_item), ref_cmp);
 335
 336        detached = (detached && (kinds & REF_LOCAL_BRANCH));
 337        if (detached && has_commit(head_sha1, with_commit)) {
 338                struct ref_item item;
 339                item.name = xstrdup("(no branch)");
 340                item.kind = REF_LOCAL_BRANCH;
 341                hashcpy(item.sha1, head_sha1);
 342                if (strlen(item.name) > ref_list.maxwidth)
 343                              ref_list.maxwidth = strlen(item.name);
 344                print_ref_item(&item, ref_list.maxwidth, verbose, abbrev, 1);
 345                free(item.name);
 346        }
 347
 348        for (i = 0; i < ref_list.index; i++) {
 349                int current = !detached &&
 350                        (ref_list.list[i].kind == REF_LOCAL_BRANCH) &&
 351                        !strcmp(ref_list.list[i].name, head);
 352                print_ref_item(&ref_list.list[i], ref_list.maxwidth, verbose,
 353                               abbrev, current);
 354        }
 355
 356        free_ref_list(&ref_list);
 357}
 358
 359struct tracking {
 360        struct refspec spec;
 361        char *src;
 362        const char *remote;
 363        int matches;
 364};
 365
 366static int find_tracked_branch(struct remote *remote, void *priv)
 367{
 368        struct tracking *tracking = priv;
 369
 370        if (!remote_find_tracking(remote, &tracking->spec)) {
 371                if (++tracking->matches == 1) {
 372                        tracking->src = tracking->spec.src;
 373                        tracking->remote = remote->name;
 374                } else {
 375                        free(tracking->spec.src);
 376                        if (tracking->src) {
 377                                free(tracking->src);
 378                                tracking->src = NULL;
 379                        }
 380                }
 381                tracking->spec.src = NULL;
 382        }
 383
 384        return 0;
 385}
 386
 387
 388/*
 389 * This is called when new_ref is branched off of orig_ref, and tries
 390 * to infer the settings for branch.<new_ref>.{remote,merge} from the
 391 * config.
 392 */
 393static int setup_tracking(const char *new_ref, const char *orig_ref)
 394{
 395        char key[1024];
 396        struct tracking tracking;
 397
 398        if (strlen(new_ref) > 1024 - 7 - 7 - 1)
 399                return error("Tracking not set up: name too long: %s",
 400                                new_ref);
 401
 402        memset(&tracking, 0, sizeof(tracking));
 403        tracking.spec.dst = (char *)orig_ref;
 404        if (for_each_remote(find_tracked_branch, &tracking) ||
 405                        !tracking.matches)
 406                return 1;
 407
 408        if (tracking.matches > 1)
 409                return error("Not tracking: ambiguous information for ref %s",
 410                                orig_ref);
 411
 412        if (tracking.matches == 1) {
 413                sprintf(key, "branch.%s.remote", new_ref);
 414                git_config_set(key, tracking.remote ?  tracking.remote : ".");
 415                sprintf(key, "branch.%s.merge", new_ref);
 416                git_config_set(key, tracking.src);
 417                free(tracking.src);
 418                printf("Branch %s set up to track remote branch %s.\n",
 419                               new_ref, orig_ref);
 420        }
 421
 422        return 0;
 423}
 424
 425static void create_branch(const char *name, const char *start_name,
 426                          int force, int reflog, int track)
 427{
 428        struct ref_lock *lock;
 429        struct commit *commit;
 430        unsigned char sha1[20];
 431        char *real_ref, ref[PATH_MAX], msg[PATH_MAX + 20];
 432        int forcing = 0;
 433
 434        snprintf(ref, sizeof ref, "refs/heads/%s", name);
 435        if (check_ref_format(ref))
 436                die("'%s' is not a valid branch name.", name);
 437
 438        if (resolve_ref(ref, sha1, 1, NULL)) {
 439                if (!force)
 440                        die("A branch named '%s' already exists.", name);
 441                else if (!is_bare_repository() && !strcmp(head, name))
 442                        die("Cannot force update the current branch.");
 443                forcing = 1;
 444        }
 445
 446        real_ref = NULL;
 447        if (get_sha1(start_name, sha1))
 448                die("Not a valid object name: '%s'.", start_name);
 449
 450        switch (dwim_ref(start_name, strlen(start_name), sha1, &real_ref)) {
 451        case 0:
 452                /* Not branching from any existing branch */
 453                real_ref = NULL;
 454                break;
 455        case 1:
 456                /* Unique completion -- good */
 457                break;
 458        default:
 459                die("Ambiguous object name: '%s'.", start_name);
 460                break;
 461        }
 462
 463        if ((commit = lookup_commit_reference(sha1)) == NULL)
 464                die("Not a valid branch point: '%s'.", start_name);
 465        hashcpy(sha1, commit->object.sha1);
 466
 467        lock = lock_any_ref_for_update(ref, NULL, 0);
 468        if (!lock)
 469                die("Failed to lock ref for update: %s.", strerror(errno));
 470
 471        if (reflog)
 472                log_all_ref_updates = 1;
 473
 474        if (forcing)
 475                snprintf(msg, sizeof msg, "branch: Reset from %s",
 476                         start_name);
 477        else
 478                snprintf(msg, sizeof msg, "branch: Created from %s",
 479                         start_name);
 480
 481        /* When branching off a remote branch, set up so that git-pull
 482           automatically merges from there.  So far, this is only done for
 483           remotes registered via .git/config.  */
 484        if (real_ref && track)
 485                setup_tracking(name, real_ref);
 486
 487        if (write_ref_sha1(lock, sha1, msg) < 0)
 488                die("Failed to write ref: %s.", strerror(errno));
 489
 490        if (real_ref)
 491                free(real_ref);
 492}
 493
 494static void rename_branch(const char *oldname, const char *newname, int force)
 495{
 496        char oldref[PATH_MAX], newref[PATH_MAX], logmsg[PATH_MAX*2 + 100];
 497        unsigned char sha1[20];
 498        char oldsection[PATH_MAX], newsection[PATH_MAX];
 499
 500        if (!oldname)
 501                die("cannot rename the current branch while not on any.");
 502
 503        if (snprintf(oldref, sizeof(oldref), "refs/heads/%s", oldname) > sizeof(oldref))
 504                die("Old branchname too long");
 505
 506        if (check_ref_format(oldref))
 507                die("Invalid branch name: %s", oldref);
 508
 509        if (snprintf(newref, sizeof(newref), "refs/heads/%s", newname) > sizeof(newref))
 510                die("New branchname too long");
 511
 512        if (check_ref_format(newref))
 513                die("Invalid branch name: %s", newref);
 514
 515        if (resolve_ref(newref, sha1, 1, NULL) && !force)
 516                die("A branch named '%s' already exists.", newname);
 517
 518        snprintf(logmsg, sizeof(logmsg), "Branch: renamed %s to %s",
 519                 oldref, newref);
 520
 521        if (rename_ref(oldref, newref, logmsg))
 522                die("Branch rename failed");
 523
 524        /* no need to pass logmsg here as HEAD didn't really move */
 525        if (!strcmp(oldname, head) && create_symref("HEAD", newref, NULL))
 526                die("Branch renamed to %s, but HEAD is not updated!", newname);
 527
 528        snprintf(oldsection, sizeof(oldsection), "branch.%s", oldref + 11);
 529        snprintf(newsection, sizeof(newsection), "branch.%s", newref + 11);
 530        if (git_config_rename_section(oldsection, newsection) < 0)
 531                die("Branch is renamed, but update of config-file failed");
 532}
 533
 534static int opt_parse_with_commit(const struct option *opt, const char *arg, int unset)
 535{
 536        unsigned char sha1[20];
 537        struct commit *commit;
 538
 539        if (!arg)
 540                return -1;
 541        if (get_sha1(arg, sha1))
 542                die("malformed object name %s", arg);
 543        commit = lookup_commit_reference(sha1);
 544        if (!commit)
 545                die("no such commit %s", arg);
 546        commit_list_insert(commit, opt->value);
 547        return 0;
 548}
 549
 550int cmd_branch(int argc, const char **argv, const char *prefix)
 551{
 552        int delete = 0, rename = 0, force_create = 0;
 553        int verbose = 0, abbrev = DEFAULT_ABBREV, detached = 0;
 554        int reflog = 0, track;
 555        int kinds = REF_LOCAL_BRANCH;
 556        struct commit_list *with_commit = NULL;
 557
 558        struct option options[] = {
 559                OPT_GROUP("Generic options"),
 560                OPT__VERBOSE(&verbose),
 561                OPT_BOOLEAN( 0 , "track",  &track, "set up tracking mode (see git-pull(1))"),
 562                OPT_BOOLEAN( 0 , "color",  &branch_use_color, "use colored output"),
 563                OPT_SET_INT('r', NULL,     &kinds, "act on remote-tracking branches",
 564                        REF_REMOTE_BRANCH),
 565                OPT_CALLBACK(0, "contains", &with_commit, "commit",
 566                             "print only branches that contain the commit",
 567                             opt_parse_with_commit),
 568                {
 569                        OPTION_CALLBACK, 0, "with", &with_commit, "commit",
 570                        "print only branches that contain the commit",
 571                        PARSE_OPT_HIDDEN, opt_parse_with_commit,
 572                },
 573                OPT__ABBREV(&abbrev),
 574
 575                OPT_GROUP("Specific git-branch actions:"),
 576                OPT_SET_INT('a', NULL, &kinds, "list both remote-tracking and local branches",
 577                        REF_REMOTE_BRANCH | REF_LOCAL_BRANCH),
 578                OPT_BIT('d', NULL, &delete, "delete fully merged branch", 1),
 579                OPT_BIT('D', NULL, &delete, "delete branch (even if not merged)", 2),
 580                OPT_BIT('m', NULL, &rename, "move/rename a branch and its reflog", 1),
 581                OPT_BIT('M', NULL, &rename, "move/rename a branch, even if target exists", 2),
 582                OPT_BOOLEAN('l', NULL, &reflog, "create the branch's reflog"),
 583                OPT_BOOLEAN('f', NULL, &force_create, "force creation (when already exists)"),
 584                OPT_END(),
 585        };
 586
 587        git_config(git_branch_config);
 588        track = branch_track;
 589        argc = parse_options(argc, argv, options, builtin_branch_usage, 0);
 590        if (!!delete + !!rename + !!force_create > 1)
 591                usage_with_options(builtin_branch_usage, options);
 592
 593        head = resolve_ref("HEAD", head_sha1, 0, NULL);
 594        if (!head)
 595                die("Failed to resolve HEAD as a valid ref.");
 596        head = xstrdup(head);
 597        if (!strcmp(head, "HEAD")) {
 598                detached = 1;
 599        } else {
 600                if (prefixcmp(head, "refs/heads/"))
 601                        die("HEAD not found below refs/heads!");
 602                head += 11;
 603        }
 604
 605        if (delete)
 606                return delete_branches(argc, argv, delete > 1, kinds);
 607        else if (argc == 0)
 608                print_ref_list(kinds, detached, verbose, abbrev, with_commit);
 609        else if (rename && (argc == 1))
 610                rename_branch(head, argv[0], rename > 1);
 611        else if (rename && (argc == 2))
 612                rename_branch(argv[0], argv[1], rename > 1);
 613        else if (argc <= 2)
 614                create_branch(argv[0], (argc == 2) ? argv[1] : head,
 615                              force_create, reflog, track);
 616        else
 617                usage_with_options(builtin_branch_usage, options);
 618
 619        return 0;
 620}